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Start ShoppingATHENA Hyper Race Cylinder Kit - 70cc Big Bore Piston Kit for High-Performance Racing
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Description
Elevate your powersports engine's performance with the ATHENA Hyper Race Cylinder Kit, the ultimate upgrade for racers seeking maximum power and precision. Engineered for 70cc engines, this big bore piston kit delivers a perfect blend of speed, reliability, and customizability for competitive riding.
Key Features
- Race-Optimized Design: Precision-machined components engineered for high-RPM performance and extreme durability in racing conditions.
- Customizable Build: All parts available separately for tailored engine modifications and specialized racing applications.
- Enhanced Power Output: Big bore cylinder design increases displacement for improved torque and horsepower in 70cc engines.
- Lightweight Construction: High-grade aluminum alloy reduces rotational mass while maintaining structural integrity under stress.
Why Choose This Product
Whether you're competing in track events or pushing limits on the trail, the ATHENA Hyper Race Cylinder Kit provides the performance edge needed for victory. Its modular design allows mechanics and riders to fine-tune engine specifications for optimal power delivery, while the durable materials withstand the rigors of high-speed racing. This kit is essential for riders who demand superior engine performance without compromising reliability.
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Elevate your powersports engine's performance with the ATHENA Hyper Race Cylinder Kit, the ultimate upgrade for racers seeking maximum power and precision. Engineered for 70cc engines, this big bore piston kit delivers a perfect blend of speed, reliability, and customizability for competitive riding.
Key Features
- Race-Optimized Design: Precision-machined components engineered for high-RPM performance and extreme durability in racing conditions.
- Customizable Build: All parts available separately for tailored engine modifications and specialized racing applications.
- Enhanced Power Output: Big bore cylinder design increases displacement for improved torque and horsepower in 70cc engines.
- Lightweight Construction: High-grade aluminum alloy reduces rotational mass while maintaining structural integrity under stress.
Why Choose This Product
Whether you're competing in track events or pushing limits on the trail, the ATHENA Hyper Race Cylinder Kit provides the performance edge needed for victory. Its modular design allows mechanics and riders to fine-tune engine specifications for optimal power delivery, while the durable materials withstand the rigors of high-speed racing. This kit is essential for riders who demand superior engine performance without compromising reliability.| SKU | GMEDA92AC2 |
|---|---|
| MPN | 070100 |
| Brand | Athena |
| Category | Piston kits & Components |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Honda | CRF450R | 2019-2023 |
| Honda | CRF450RX | 2019-2023 |
| Honda | CRF450RL | 2021-2023 |
Frequently Asked Questions
Most performance cylinder kits require richer jetting or updated ECU mapping to match the increased displacement and changed port timing. Consult Athena’s documentation and your tuner; running stock fueling can lead to detonation or a lean condition.
Some Athena race kits are designed to work with the OEM crank, while others recommend or require a stroker or reinforced crank. Always check Athena’s tech notes for your exact part number and model before installation.
Most bolt‑on Athena cylinder kits do not require case machining, but certain Hyper Race or big‑bore/stroker configurations may need crankcase or cylinder head machining. Confirm in Athena’s application notes for your specific bike/ATV.
Follow Athena’s recommended break‑in schedule. Typically this includes several short heat cycles or a period of light to moderate riding with varying RPM, avoiding sustained high RPM or full throttle for the first tank or two of fuel.
That depends on the final compression ratio and your engine setup. Some high‑compression race kits may require high‑octane or race fuel to prevent knock. Verify the compression specs from Athena and consult your tuner.
Installation Guide
Difficulty
Medium
Est. Time
2 hr 0 min
Tools Required
- metric socket set
- torque wrench (Nm scale)
- feeler gauges (for ring end gap check where applicable)
- piston pin circlip tool or fine pick
- soft-faced hammer
- gasket scraper or plastic razor
- shop manual for torque specs and sequence
- coolant catch pan (for liquid-cooled engines)
- clean rags and brake cleaner or contact cleaner
- assembly lube or 2‑stroke oil (for piston/rings)
- threadlocker (medium strength where specified by OEM/Athena)
Pro Tips
- Always have the OEM service manual open for your specific bike/ATV – use the OEM torque specs unless Athena provides different values.
- Lightly oil piston, rings, and wrist pin before installing; keep gasket surfaces absolutely clean and dry unless the instructions call for sealant.
- Stuff clean shop towels into the crankcase opening while working with circlips or small parts so nothing can fall inside.
- Heat the small end of the rod area and chill the wrist pin if the fit is tight – this can ease assembly without forcing parts.
- After install, use a conservative break‑in procedure (heat cycles or light riding) per Athena’s instructions before full‑throttle use.
Common Mistakes to Avoid
- Not verifying ring end gap before assembly
- Installing piston with arrow/mark not oriented toward exhaust/intake as specified
- Trapping the ring ends in the ports while sliding the cylinder on
- Reusing old base/head gaskets instead of new ones from the kit
- Not re‑torquing cylinder head after initial heat cycles (if recommended by manufacturer)
- Incorrect torque or torque pattern on head and cylinder nuts
- Failing to properly bleed cooling system on liquid-cooled engines
Comparison vs Stock/OEM
A Hyper Race cylinder kit from Athena is typically designed to increase displacement and/or improve port timing and combustion efficiency compared to the OEM cylinder and piston assembly.
Improvements
- Higher peak horsepower and torque, especially at mid to high RPM
- Potentially increased displacement (big‑bore) for stronger bottom‑end and mid‑range
- Optimized port design for race-oriented power delivery
- Often includes a high-performance piston with lighter weight or different crown design
Considerations
- May reduce engine longevity compared to conservative OEM setups if maintained or tuned improperly
- Usually requires careful tuning of jetting or ECU mapping
- May raise operating temperatures, making cooling system condition more critical
- May not be legal for all classes of sanctioned racing or for on‑road use in some regions
Durability & Warranty
Expected Lifespan
Performance cylinder kits used for racing often have shorter rebuild intervals than stock. Actual hours will depend heavily on use (practice vs. competition) and maintenance quality.
Warranty
Athena generally offers a limited manufacturer warranty against defects in materials and workmanship; details and duration vary by product and region and must be confirmed with Athena or the distributor.
Maintenance
['Perform regular compression checks to monitor top‑end health.', 'Inspect piston, rings, and cylinder wall at intervals recommended in your race or service schedule.', 'Keep air filter, cooling system, and fueling system in top condition to avoid premature wear.', 'Always use fresh, high-quality fuel and correct oil premix/ratio or oil spec.']
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